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A series of two-point crosses were carried out among seven loci (a, b, c, d, e,

ID: 12654 • Letter: A

Question

A series of two-point crosses were carried out among seven loci (a, b, c, d, e, f and g), producing the following recombination frequencies (%).

Loci      Recombination frequency                  Loci     Recombination frequency
a and b    50                                                 c and d     50
a and c    50                                                  c and e     26
a and d    12                                                 c and f    50
a and e    50                                                  c and g     50
a and f    50                                                  d and e     50
a and g   4                                                  d and f      50
b and c    10                                                 d and g      8
b and d    50                                               e and f      50
b and e    18                                                e and g      50
b and f    50                                                 f and g       50
b and g   50


Show the order and distance (in map units) between the loci in different linkage groups.

Explanation / Answer

50%-------------recombination



----- a-------------g---------------d----
                   4    8

----- c-------------b---------------e----
             10                   18

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